Lpc2000

I have done something similar.  I2S from uC to DAC looks like (quick 
review) simple SPI interface.

You need to create a system with two slave devices and an external 
source for clock and /select. Set SPI port slave, DAC already slave.

Data:  Connect directly- uC slave out to DAC in
Clock: External clock source (timer output ?) connects to both uC and 
DAC. Used to clock the data from the SPI port to the DAC.
/select: Use timer fed by clock(above) with period set to sample 
output rate and pulse width-low to count the number of bits in each 
sample.  

Now you just need to keep the SPI buffer full - either interrupt or 
polled.  The data is transfer from the SPI port (as slave) to the DAC 
clocked by the clock and /select you have supplied.

Philips has a document "I2S Bus Specification" that may be helpful,  
don't know the real .pdf filename.


Ian

--- In lpc2000@yahoogroups.com, "ee_gary" <ee_gary@...> wrote:
>
> I'm interested in this as well.  Has anyone successfully 
communicated
> with an I2S DAC using SPI?
> 
> Gary
> 
> --- In lpc2000@yahoogroups.com, "croquettegnu" <croquettegnu@> 
wrote:
> >
> > Thanks but this link concerns at91 product !
> > you mean there are no peripherals dedicated to I2S or AC97 in the
> LPC ???
> > 
> > Thanks
> > --- In lpc2000@yahoogroups.com, "ian.scanlon" <scanlon.design@> 
wrote:
> > >
> > > See:
> > > http://www.atmel.com/dyn/resources/prod_documents/doc2646.pdf
> > > 
> > > to implement in CPLD.
> > > 
> > > You can also set the SSP as slave and use internal timers and 
some 
> > > external logic to generate required signals and timing.
> > > 
> > > Ian
> > > 
> > > 
> > > --- In lpc2000@yahoogroups.com, "croquettegnu" <croquettegnu@> 
wrote:
> > > >
> > > > I need to use the I2S protocol and I am looking for what would
> be the
> > > > most appropriate peripheral to deal with ???
> > > > 
> > > > Is AC97 possible too ?
> > > > 
> > > > Thanks a lot !
> > > >
> > >
> >
>